A．whileB．thatC．whenD．whether

Do you believe the things __ he said？A.whatB.thatC.whenD.how how how how how

【C16】A．ifB．thatC．whatD．whether

【C5】A．whichB．whereC．whenD．whether

It makes no difference to me _________ he willcome or not.A.howB.whyC.whenD.whether

I have no doubt ________he will overcome all his difficulties.A、ifB、thatC、as toD、whether

You will see to______the engine does not get out of order.A．it thatB．thatC．whichD．whether